Hello Tony, well I'm not sure about this comment and it's appropriateness in this forum but a couple of things: firstly I too use to bemoan the X series and don't get me wrong they're still issues. The multi-dock I still hate and have no real use for...at the moment, perhaps when I go multi-screen I might. But apart from that now I have got use to all the whacky changes I use to fire up about "I have learned to love the bomb" or at least put up with it.
Secondly, the Pro Channel stuff is too good to ignore and being stuck in 8.53 land means you ignore it...at your own peril. Honestly I need a few extra bit's and pieces, exotic stuff and the Pro Chanel stuff, it's my goto EQ and Compressor, couple that with the tape sim, although it's not that impressive and the console emulator (Which is impressive) and you have a lot of reasons to upgrade. Then there is touchscreen implementation (still a little gimmicky for me, I have a touchscreen but have yet to use it but I can envision a day when I will def use).
So my advice for you Tony is "learn to love the bomb" oh there were a couple of useful things, which you will have missed out on now because you didn't upgrade...most notably R-Mix, handy...not the best but handy. And of course you miss out on Melyodyne, which when used properly as an effect not a pitch correction tool can be useful for strange things...robot voices, robot choirs yada, yada.
Ben